It was soon realized that what was to become known as chromatic aberration was a limiting factor in refracting telescopes, and that this could be overcome by making lenses with longer focal length ...

Designers of refracting telescopes figured out, for one, that by using two different kinds of glass together in the objective lens, they could cause the red and blue ends of the spectrum to ...

Are monoculars suitable for astronomy? The simple answer is yes, but with a few limitations that you should be aware of ...

Refracting: A refracting telescope, also known as a refractor telescope, is a type of optical telescope that uses refracting optics such as lenses to form an image. Catadioptric: A catadioptric ...

The standard telescope of Newton's time, the refracting telescope, was not ideal. Its glass lenses focused the different colors inherent in light at different distances. This resulted, at the ...

The original instrument to occupy the 25-foot diameter dome was the 10.5-inch Bausch refracting telescope (f/15.5) installed in the brand new observatory in 1953. Bausch & Lomb Company gave the ...

Supplier: Tele Vue Optics, Inc. Description: Specifications TV - 85TypeAPO (Doublet) Refractor (Elements/Groups: 2/1) Objective (mm) 85 Focal Length (mm) 600 Focal Ratio (f/#) 7 Drawtube/Focuser2-in ...

See how telescopes capture the cosmos. ExtremeTech explains the science behind lenses and space exploration. Start exploring ...

From lens focal lengths and fill-flash to portraits, macro or stunning landscapes there are techniques for everyone. Learn how to use metering, considering composition and shoot everything from ...